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VAC/BOOST Guage Data Log

 
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  #1 (permalink)  
Old 22 Apr 2003, 11:40 am
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Location: Los Angeles, California, USA.
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Default VAC/BOOST Guage Data Log

One stop shopping for what readings to expect with a combo Vac/Boost guage in your PT Cruiser GT.
Upper and lower airbox silencer delete and K&N drop in filter results:
Idle cold in park: 12-14 Hg
Idle warm in park: 18 Hg
Idle in drive: 12-14 Hg
Coasting in D around 35mph: 20 Hg
Coasting in D around 65mph: 24 - 28 Hg
quick gradual 60-80% throttle: 5-8 Psi dropping rapidly
Mashed from a stop: 14 psi through 1st gear dropping down to 2 or 3 psi during shift and going back to 10 dropping fast to 8psi or lower depending on how the computer thinks it feels (ie inconsistent).
----------------------------------------------------------------
Hallman ES manual boost controller installed and conservatively set:
Same previous idle readings.
Driving around town 25-45mph steady foot: 10-14 Hg (good mpg here)
Slight need to accelerate when passing 25-45mph gradually adding approx 30% more throttle: INSTANT 5-7 PSI (pshhhhhheeeee)
Getting on freeway from a stop(mash pedal): INSTANT 14 PSI with screechin tires then slowly drops to 12 and stays until I let off throttle at 65MPH.
Cruising on freeway 65MPH flat area(steady foot): 10-12Hg
Cruising on freeway 65MPH slight incline(throttle as needed): 4-8Hg
Passing on Freeway from 60MPH no downshift gradually adding approx 30%-40% throttle: hits 10-12PSI quick
Passing on Freeway from 65MPH w/downshift and WOT: INSTANT 14PSI just before downshift then drops to 8PSI and climbs right back to ~12PSI

------------------------
2003 PTCruiser GT
Mods:!Airbox silencers
K&N Filter(2153)
Autometer Pod - Boost/Vac and Volts
Hallman ES Boost Controller running 12PSI steady 14PSI peak
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Old 22 Apr 2003, 05:03 pm
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Looks like you've done your homework. Have you set any trouble codes?
<img src=icon_smile_tongue.gif border=0 align=middle>
As a sidenote, late model Vettes back out timing (known as torque management)just prior to shifting, i.e., 1-2, 2-3 and 3-4, to "increase" the tranny life. First time I drove it I thought I had a serious problem, of course, this has been corrected by re-programming the PCM. Possibly, D-C is trying to accomplish the same thing by backing out boost at shift points. Just a thought.
Steve

'03 GT Cruiser,White w/ Auto Stick, K&N w/ Mod. Air Box,Alpine XM radio
'02 Corvette (555netHP)
Member of 11sec. club &
NRA Patron Member


Edited by - Steve03GT on 04/22/2003 16:21:35
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Old 22 Apr 2003, 05:54 pm
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No codes so far in over 100 miles of driving, but I am being really conservative with regard to the boost controller setting.
You're probably right as the older Standard PT had a torque management system that was defeated by clipping 1 wire.
Bummer though is that the PT GT does not appear to have this easy 1 snip wire. Looks like a chip is needed now. Until someone hooks up an Autotap/OBD type logger we won't know for sure. It does seem like the system pulls alot of funny business during shifts. With the boost controller this effect is much more pronounced.
As I recall 1997-2003 Corvettes have their torque limit set to 350 ft/lbs, but only seems to affect the autos. My Z06 had no noticeable changes when this value was altered using LS1/LS6 Edit.

------------------------
2003 PTCruiser GT
Mods:!Airbox silencers
K&N Filter(2153)
Autometer Pod - Boost/Vac and Volts
Hallman ES Boost Controller running 12PSI steady 14PSI peak
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Old 07 May 2003, 06:26 pm
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Join Date: Dec 2002
Location: Half Moon Bay, CA, USA.
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I haven't installed my controller yet as I just did the boost gauge. I have the silencers out and the K&N filter in place. I'm only seeing 10 psi max boost. I'm getting the vacuum pattern noted above, but certainly not the boost. I'm hooked up per the pic at http://www.vinylguy.com/boostgauge.htm.

I'm trying to borrow another boost gauge (or I'll pull the one in my RX-7) to confirm whether the boost gauge is defective or I'm not making boost.
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Old 07 May 2003, 08:04 pm
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Join Date: Sep 2001
Location: Vestal, NY, USA.
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Nice data...I only have boost gage not vacuum/boost combo. Wish I had combo . I'm still adjusting mine downward as I get p1188 occasionally. I presently am running 11 psi but get spikes to 14.
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Old 07 May 2003, 11:27 pm
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do we need to have a boost/vac combo or will just a boost gauge do fine?
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Old 08 May 2003, 03:13 am
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I really think having both Vac and Boost is important to be able to note total engine performance, as well as helping to get decent gas mileage when you want it.

It's nice, but not a need...

As for my current settings:
MBC@8PSI mash from a stop: instant 8psi builds up to 14psi and drops to 12,11,finally holding at 11psi til around redline.
MBC@8PSI mash from 60-65mph: spikes to 15psi and quickly drops to 8 building up to and holding around 11psi
At higher rpms boost tends to be consumed up by the motor and the bov.

So far at this setting I seem to be ok with no codes.

Interesting thing though is that when reset by battery disconnect the car drives totally different for about 20 miles.
Without changing the boost controller it will spike past 15psi.
Wide open will shoot straight to 14psi and act kinda sporatic.

This PT computer is screwing us on the power and the shifts, you can feel there is a whole lot more power to be had as sometimes it doesn't seem to catch it fast enough and lets it rip really good then pulls power. Watching the combo guage really shows this.

Auto-stick(red-line) mode with trac control off seems best for me so far. No need to push the stick up as it shifts right on the money and drops you back in the right rpm spot with at least 10psi.

More later...
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------------------------
2003 PTCruiser GT
Mods:!Airbox silencers
K&N Filter(2153)
Autometer Pod - Boost/Vac and Volts
Hallman ES Boost Controller running 12PSI steady 14PSI peak
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